GTA 5 money: How to make the big bucks The core gameplay consists of elements of a third-person shooter and a driving game, affording the player a large, open environment in which to move around. If the player is trying to steal a vehicle inside Fort Zancudo, they should take massive caution as there are up to 4 Rhino tanks doing patrol in and around the base. description just a small millitary base thats hidden. The base serves as a military-operated airfield and munitions depot for the United States Air Force. I will not be posting screenshots of it or its location its a hidden base and it has to be found! Yeah I don't remember anything about a 'secret' military base, just the one they could see while skydiving.